Fix sourceSets dir declarations
Fix sourceSets dir declarations

to not include default dirs. This is only relevant for IDEs (e.g. NetBeans) to better display the project structure.

alkacon/opencms-core,ggiudetti/opencms-core,gallardo/opencms-core,mediaworx/opencms-core,gallardo/opencms-core,mediaworx/opencms-core,ggiudetti/opencms-core,alkacon/opencms-core,gallardo/opencms-core,ggiudetti/opencms-core,gallardo/opencms-core,ggiudetti/opencms-core,mediaworx/opencms-core,alkacon/opencms-core,alkacon/opencms-core,mediaworx/opencms-core